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Db Conf Assistant error while installing on Linux

Hello everyone, I get the following error at the end of 9i installation, when the different tools are being started. The tool in question is the Database Configuaration Assistant, which fails during the "Creating and starting Oracle instance". I get the message "ORA-27123: unable to attach to shared memory segment". The error messages book says the following about error 27123:

I am not sure if the oracle account under which I am installing 9i has the right credentials, how can I check that? The problem might be something else though. Any help is greatly appreciated. Thank you.

Thanks for your response. I have added the oracle account to the groups you mentioned and I still get the same error. I am looking into the vendors info on SHMAT at the moment.

I have been away from Oracle for a couple of years, there used to be a site that was run by oracle and it was basically linked to their tech support database. I used to go there and enter the error number and it would bring up multiple entries of people with the same problem and OTS's directions on fixing the problem. Anyone know that site? Could you please tell me what site it is? Thank you.